Harry mortimer



May 1, 1928. 1,667,748

. H. M. SPECHT VARIABLE CONDENSER Filed June 5, 1924 Patented lVlay l,1928.

UNITED STATES PATENT OFFICE.

VARIABLE CONDENSER.

Application med :une 5, 1924. seriai No. Y717,969.

'f denser constructed inv such a in anner as'to prevent the possibility.ofv contact of t1i'e:,in` tei-leaving plates and substantiallyvincreasing the amount of plate space foijholding the electrons andprotons, accomplishing e this ina reduced space thereby increasing theefiieiency iii the handling of E. M. F. as compared to the condeiisersof the prior art.

My device is also adapted to accomplish the result of two condensersiii-one both in volume of E. M. F. and inl the .variationfo'f thepossible adjustments in regardtliereto. In this way my device .obvi'atesthe necessity of a Vernier attachment. as the divisioiiof the rotormembers into quarterfspherical concentric plates permits of veryv tineadjustments, each rotor beingv independently operated and adjusted. y i

Referring to the drawings Figure 1-.s an illustrative cross verticalsection "showing the shafts and one of each of the'cup mem# bers of therotor and stator series in the interleaved position. Figure 2 is alongitudinal vertical section of my device on the line 2 2 of Figure 1.Figure 3 is a cross section on the line 3-3 of Figure 4. Figure 4 is aperspective of the middle slotted shaft. Figure 5 is a perspective ofthe outer slotted shaft broken away for convenience inV illustration.Figure 6 is a vertical section on the line G-G of Figure 5. Figure 7 isa detail of the electrical connections shown at the left'hand end ofFigure 2.

In the drawings 1() is a central 'shaft to which is -i'igidly securedconcentrically a series of quarter spherical cup members 11 and saidshaft 10 has the usual rotor handle 12 also rigidly secured thereto. Acylindrical insulating member 13 is adapted to slide over said shaft 10and an intermediate hollow cylindrical shaft 14 is adapted to be mountedover `said .shaft l() and the insulatingr member 13 and to said shaft 14is rigidly secured coiicentrically a second series of quarter sphericalcup members 15 and a rotor handle 16 is rigidly secured to the outer endof said shaft 14. The shaft 14 has slots 17 permitting the quarterspherical cup members 11 to pass therethrough and rotate'asl may bedesired. An insulating member 18 is mounted over said hollow cylindricalshaft 14 and an outer hollow cylindrical shaft 19 is mounted over saidAinsi'ilatingmember 18 and the shaft 14. A series ofuconcentric quarterspherical cup members 20 rigidlymounted on one Side ofsaid shaft 1 9 anda 'second series of concentric quarter spherical cup members 21 'isrigidly mounted on vthe opposite side'of said shaft I19 in aposition'diametrically opposed to the first series of cup members 20.The shaft 19 is slotted at 22 and 23 to provide for the passagev throughand them'oveinents ofthe two series of,l quarter spherical cup members,11 and 15 andvsaid shaftv19 is a fixed shaft: which is.not adapted tomove but isa stator shaft. i

,In .assembling my device central shaft 10 will`ha've cylindricalinsulating member 13 mounted thereover. 'Intermediate hollow cylindricalshaft` 14 will then bev mounted thereover and cylindrical insulatingmember. 1S will be mounted thereover. i Outerhollow stator cylindricalshaft 19` will then be mounted thereover, The shaft 10, insulatingmember'13, hollow' cylindrical" shaft 14," insulatingmember 18 and outercylindrical shaft 19 lwill .in' this way be assembled in their properpositions before the quarter spherical cup members are mounted.v Shaft14 has slots 17 and shaft 19 has slots 22 and 23, all of which permitthe described movement ofthe quarter'spherical cup members 11 and 15 andsaid spherical cup members 11 and 15 will be rigidly secured to saidshafts 10 and 14 respectively in the usual and well known manner throughslots 17 of shaft 14 and slots 22 and 23 of'shaft 19, the

insulatingr members 13 and 18 having the necessary slots in alignmentwith the aforementioned slots as shown in the drawing. The quarterspherical cup members 20 and 21 will then be rigidly mounted in theusual well known manner to the shaft 19 in the positions as describedand shown in the drawing.

On the end of the shaft 19 opposite to the rotor handles 12 and 16 isadapted to be mounted by means of a nut 24 insulated by the outerannular insulation member 25 and by means of a nut 26 insulated by meansof the inner annular insulation member 25 and also by `annularinsulation member 27, electrical terminal connections of usualconstruction 22* which connects with the stator cup members 20, and 23*which connects with the rotor cup members 11 and 15.

The operation of my device is most simple and the series of rotor cupmembers 15 may be turned into the full interleaved position with thestator cup members 20 as shown in Figure 1 by lmeans of turning thehandle 16 so that they are in the position shown in Figure 1 and therotor cup members 11 may be turned in'a similar manner into fullinter'leaved position with the stator cup member`s21 as also shown in Fiure 1 by the turning of the 4handle 12. ither of the series of cupmembers 15 or 11 may be left in the o'pen or non-interleaved position asshown' in dotted outline in connection with the rotor cup members '15 inFigure 1 and the other series of rotor cup members turned until the.position desired is found or if it is'desired the two handles 12 and 16may be turned together so that the rotor cup members 11 and 15 may beturned simultaneous ly. It is thusse'en that many variations may beeffected by means of my device as the two series of rotor cup members 11and 15 may be' operated together or separately and when one series hasbeen adjusted the other maybe very slightly .turned in 'order to effectthe result usuallyobtained by means of a vernier. y

Many other means than vthose shown may be usedfor carrying out theinvention described and claimed.withoutdeparting from the 'spirit'olsaid invention as the device shown illustrates merely one way ofcarrying out my invention.

My device4 is adapted to elect a low loss, that is the construction issuch as to reduce the leakage of electric Iradio current in a verysubstantial manner as compared with the prior art devices, therebyincreasing the efficiency of the condenser. It is also apparent that theconstruction of my device is such as tovmake it more dust proof andmoisture 4proof than the flat plate type of condenser of the prior artand the encasing of my device in a glass outer container would make itabsolutely dust and moisture proof. Through the usual operation of mydevice greater selectivit is possible, more distance and a remarka leincrease in volurne, all of which are most essential feature, in theoperation of a radio receiving set.

I claim:

1. A variable condenser comprising trro series of concentric statorquarter spherical cup members mounted diamctrically opposite to eachother and two series ot' conccn tric rotor quarter spherical cup membersalso mounted diametrically opposite to earh other and lying between saidtwo stator series in the open position and means for rotatingr bothseries of said rotor members.

2. In a variable condenser the combination of a series of concentricrotor quarter spherical cup members rigidly secured to a central shaft,two series of concentric stator quarter spherical cup members rigidlysccured diametrically opposite each other to a suitably slotted shaftmounted over said central shaft and insulated therefrom, a second seriesof concentric rotor quarter spherical cup members rigidly secured to asecond slotted shaft mounted over said first slotted shaft and insulatedtherefrom. together with connecting terminals on each ot' said shafts.

3. A variable condenser comprising two series of concentric statorquarter spherical cup members secured in a position diametricallyopposite each other, two series of con centric rotor'quarter sphericalcup members mounted between said two stator series each adapted to turninto and out of full interleaved relationbetween one of the series ofstator cup members and means for effecting such interleaved relationindependently Vcontrolled for each series of rotor cup members.

4. In a variable condenser the combination of two series of concentricstator quarter spherical cup members secured in a position dlametricallyopposite each other, two series of concentric rotor quarter sphericalcup members each series. independently controlled and each adapted toengage in interleaved relation one of the .said stator seriessimultaneously.

5. In a variable condenser two series of concentric stator quarterspherical cup members, two series of concentric rotor quarter sphericalcup members and means for operating the two rotor series independently.

In testimony whereof I allix my signature.

HARRY MORTIMER SPECHT.

